| Contrast | G1 | G2 | G3 | G4 |
|---|---|---|---|---|
| A | -1 | -1 | 1 | 1 |
| B | -3 | 1 | 1 | 1 |
| C | -1 | 1 | -1 | 1 |
Analysis of Variance
Department of Educational Psychology
Agenda
1 Overview and Introduction
2 Continuing Mean Comparisons
3 Conclusion
Agenda
1 Overview and Introduction
2 Continuing Mean Comparisons
3 Conclusion
A priori / planned / orthogonal comparisons are used to test specific contrast hypotheses established prior to collecting the data.
Contrasts are orthogonal if the tests are independent of one another: that is if the outcome of one contrast cannot predict the outcome of the other contrast. Two contrasts are orthogonal if they account for non-overlapping between group variance.
Two contrasts are orthogonal if the sum of the cross-product of the corresponding coefficients of these contrasts equals zero:
| Contrast | G1 | G2 | G3 | G4 |
|---|---|---|---|---|
| A | -1 | -1 | 1 | 1 |
| B | -3 | 1 | 1 | 1 |
| C | -1 | 1 | -1 | 1 |
Agenda
1 Overview and Introduction
2 Continuing Mean Comparisons
3 Conclusion
Module 5 Lecture - Non-parametric Comparisons for More than Two Groups || Analysis of Variance